Chair for reenforcing steel



May 27, 1924. 1,495,659

W. W. WILLIAMSON CHAIR FOR REENFORCING STEEL Filed Aug. 15. 1922 INVENTOR. T l J V. Willa/Won XSL.

A TTORNEY Patented May 27, 1924.

,HNHTED STATES lAtSfiSt CHAIR FOR 'REENFO'RCING STEEL.

Application filed August 15, 1922. SerialNo. 581,914..

I '0 all whom it may concern.

Be it known that I, /VILBUR W. TVJLLIAM- soN, a citizen of the UnitedStates, residing at Stockton, county of San Joaquin, State ofCalifornia, have invented certain new and useful Improvements in Chairsfor Beenforcing Steel; and I do declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the characters of reference markedthereon, which form a part of this application.

This invention relates toimprovements in devices for supportingreenforcing bars such as are used in reinforced concrete constructionfrom the mold in which the concrete is poured. Y

The principal object of my invention is to provide a device forsupporting the bars at desired intervals, in such a manner that the barswill be maintained at the same level from the mold throughout thelength; which is proof against being disturbed by the pouring of theconcrete, and which also firmly holds the bars from movement with suchpouring.

Another object is to provide a device for the purpose so constructedthat a single size of the device may be used for supporting bars usedeither in slab work or beams-two forms of construction in which acceptedpractice demands that the reenforcing steel be held at differentdistances from the mold, or what in thefinished result becomes the outersurface of the slab or beam.

The chairs are also formed so that they may be placed in their properpositions after the steel is in place, and which permit of anunobstructed flow of the concrete under the steel.

A further object of the invention is topro= duce a simple andinexpensive device and yet one which will be exceedingly effective forthe purposes for which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in the several views.

Fig. 1. is a perspective view of a length of reenforcing bar showing theapplication views of different forms of chairs. a

of my improved chair thereto when said bar is used in slab work. I

Fig. 2. is a similar View, showing the position of the chairs when thebar is used in a beam. Figs. 3, 4 and 5 areperspective Referring nowmore particularly to the characters of reference on the drawings,'thedevice in all forms consists of a rectangular metal plate 1 of suitabledimensions out in one side of which an uneven distance from the ends isa rectangular recess 2 to receive therein a standard square bar ofreenforcing steel 3, there being one size of chair for each size of bar.I

The horizontal extent of the recess 2 is somewhat greater than a side ofthe bar, while the height of said recess is sufficiently greater thanthat of the bar so that the chair,

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when positioned, will rest at an angle of the I be the correct distancewhich the bar shouldv be from the mold in slab work.

Similarly, when the chairs are reversed in position, the greater heightat which the bars are there supported from the mold will be correct forbeam work.

In the type of chair shown particularly in Fig. 3, the height of therecess is the same throughout its extent. In the type illustrated inFig. 4, the recess for a portion of its length adjacent its outer end isof just suflicient height as at 2 to receive the bar therethrough whenthe bar is held at right angles to the chair. The inner portion 2 of therecess however, is of suificiently greater depth than the portion 2 sofor a length slightly greater than the length of a side of the bar, andof sufficiently greater height than the bar and portion 2 so that thechair will rest at the above named angle to the bar.

With either type, this positioning of the chair at an angle serves toform a wedge fit with the bar, firmly holding thesame againstdisplacement relative thereto.

Additional safeguard against lateral movement of the bar in the chair isprovided in the type just above described, in which the enlarged recessportion 2 'forms a seat for the bar in addition to the wedging feature.

If desired, especially for use with heavy steel the chairs in order toprevent them being possibly bent with the weight of the bars restingthereon, may be provided with a rib 5 extending from top to bottom toone side of the bar-recess, as shown in Fig. 5.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as the invention, as defined by the appendedclaims.

Having thus described my invention, what I claim as new and useful anddesire to cure by Letters Patent is:

1. A bar supporting chair consisting of a flat plate provided with arecess in one side of greater height than the thickness of the bar to bereceived therein; the ends of the plate beingclear of the bar wherebythe plate will rest at an angle to the bar and the upper and lower edgesof the recess will impinge against the bar.

2. A bar supporting chair consisting of a flat plate either of whose endedges is adapted to rest on a mold; said plate having a side recess toreceive a bar therein.

In testimony whereof I am my signature.

WILBUR W. XVILLIAMSON.

20 do not form a departure from the spirit of

